An Improved Interleaved Flyback Converter with Reduced Voltage Stress and Current Auto-sharing

다국어 초록 (Multilingual Abstract)

The interleaved fl yback converters are widely used for the application of the renewable energy sources, electric vehicles, LED drivers et al. However, there are some challenges for this topology, such as leakage inductor energy of transformer, output current ripple, and high voltage stress of main switch. In order to solve the above problem existed in the converter, an improved interleaved fl yback converter with adding series capacitor is proposed in this paper. Through utilizing of active clamp technique for the converter, leakage inductor energy is observed and released, zero voltage switching of main switch are achieved. Furthermore, intrinsic current sharing of two phase fl yback converter could be automatic obtained without any voltage/current sensors by through charge balance for series capacitor existed in this converter topology. Thus, output current ripple is reduced and high effi ciency of interleaved fl yback converter is acquired. Comprehensive operational principle analysis and performance analysis are provided. Finally, a 60 W prototype is built to verify the analysis.